Canine Hyperthyroidism
Canine hyperthyroidism is characterized by the overproduction of thyroxine, a hormone secreted by the thyroid gland. Although a rare condition for dogs, it usually affects middle-aged to older dogs. The disease progresses slowly, but can affect many different organ systems.
Causes
The most common cause of canine hyperthyroidism is cancer of the thyroid gland. The cancer cells cause a mass to form on the gland which impedes proper functioning. The gland will then start producing too much thyroxine.
Symptoms
The most common symptom of canine hyperthyroidism is weight loss. Your dog will lose weight although he will have a larger than usual appetite. Other symptoms of this condition include elevated heart rate, increased urination, and hyperactivity. In some cases, dogs may have decreased activity, weakness, and a small appetite.
Diagnosis
There are a number of blood tests used to diagnose canine hyperthyroidism. Although your dog may have this condition, the levels of thyroid hormones in the blood may be normal. Therefore, the veterinarian may request a second test be done in a couple of weeks. The vet will also need to perform a physical exam to check for an elevated heart rate or enlarged thyroid gland.
Treatment
Canine hyperthyroidism can be treated with a drug to control the production of thyroid hormones. Another treatment option is surgery. Your dog will have one or both of his thyroid glands removed surgically. However, surgery to treat hyperthyroidism can result in your dog developing canine hypothyroidism. This is a condition in which there are too few hormones produced.
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